How can I stop having really intense nightmares?

Every night for the past four nights I’ve continued to have the most bizarre, vivid nightmares/dreams, and I want it to stop. I’m not taking anything at the moment, so I know it’s not because of excess serotonin. I thought it was because I was taking melatonin, but I didn’t take any last night and I still had another fucked up dream.

Is there anything I can do?